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Course Documents
Chapter 1 - Intro
Chapter 2 - Methods for Describing Sets of Data
Chapter 3 - Probability
Chapter 4 - Discrete Random Variables
Chapter 5 - Normal Random Variables
Chapter 6 - Sampling Distributions
Chapter 7 - Confidence Intervals
Chapter 8 - Tests of Hypothesis: One Sample
Chapter 9 - Confidence Intervals and Hypothesis Tests: Two Samples
Sample Exam I: Chapters 1 & 2
Sample Exam II: Chapters 3 & 4
Sample Exam III: Chapters 5 & 6
Sample Exam IV: Chapters 7 & 8
I am reviewing each section before taking the practice exam and I am doing all of the practice problems provided on this website. I am having some trouble solving number 2 from the "NOW YOU TRY IT" for section 2.6.
(2. In July of 2011, the average age of cars on the road in the US was a record high of 11.1 years old. The standard deviation of car ages was 3.2 years old. If nothing is known about the shape of the distribution, give an interval of car ages that will contain the ages of at least 88.9% of car ages.) I would appreciate it if you could help me!!!!!!!! Thanks,
Posted to STATS 1 on Tuesday, January 28, 2014 Replies: 1
Hi Ruby,
I have created a video that explains how to solve this problem. Watch it, and let me know if you still have questions.
Professor McGuckian
STATS1
STATS2
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